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3x + 4y = 8500 / x 1 5.1500 + 2y = 9500
7500 + 2y = 9500
10x + 4y = 19000 2y = 9500 - 7500
3x + 4y = 8500 2y = 2000
y = 1000
7x = 10500
x = 1500
jadi 2x + 3y = 2.1500 + 3.1000 = 3000 + 3000 = 6000